Prosecutors have delayed for three months a decision on whether to charge three former executives of Tokyo Electric Power Co. for their handling of the 2011 Fukushima disaster, an official with a panel that requested the indictments said Friday.

The Tokyo District Prosecutor’s Office had been re-investigating the case after an independent judicial panel of citizens ruled in July that three former Tepco executives, including then-chairman Tsunehisa Katsumata, should be indicted over their handling of the world’s worst nuclear disaster since the 1986 Chernobyl explosion.

Prosecutors on Friday informed the Committee for the Inquest of Prosecution of its decision to extend the probe by three months through the end of January, saying it was too difficult to reach a decision by the end-of-October deadline.

By law, prosecutors can extend investigations for up to three months.